Multifocal Metasurface Lens

Multifocal Metasurface Lens for use in Continuous Wave Doppler Radar

Presenter: David House

Presenter Status: Graduate student

Department: Engineering

Screenshot URL: https://drive.google.com/uc?id=1E28byR7UJw4TqnzjZ6eDQlRGCgxk-iFf

Abstract:
A multifocal metasurface lens for continuous wave Doppler radar was designed for the K band to be used 0.5 mm away from a patch array antenna. A 2 layer dogbone structure was used for its simplicity and its proven control of the phase of an incident wave. Once an adequate range of phase shifts and magnitudes was found through simulations, they were placed in such a way to focus the wave in 1 dimension then in 2 dimensions. The simulations provided promising results in the gain across a large range and the metalenses were then fabricated and tested. The tests confirmed that a structure of dogbones set up with varying phase shifts vertically, interacted with the field much more effectively than if they were set up horizontally. The 2-layer dogbone metaparticle has potential to be used in the application of a metalens, however, the control of the field only occurs in one orientation. This means that it can create a cylindrical phase front well, but not a spherical one.